Electric-arc lamp.



J. GELB. ELECTRIC ARC LAMP;

APPLICATION FILED JUNE 29. I916.

1,272,418. Patented July 16, 1918.

4 SHEETS-SHEET I.

7 3;, 7% "k Y V V X X 7I--- N J 47 6 0'- Z/ U P Z 0/ INVENTOR.

I Jo efl 6m 5R5 co Puomurna. WASNINGTDN. o. c.

J. GELB.

ELECTRIC ARC LAMP.

APPLICATION FILED mu: 29.1916.

1,272,418; Patented July 16, 1918.

4 SHEETS-SHEET 2.

N V EN TOR.

no: "cams r. 4 Lu..PNOTD-LITNO..WASNING1BN. a c.

l. GELB.

ELECTRIC ARC LAMP.

APPLICATION FILED JUNE 29,1916.

Patented July 16, 1918..

4 SHEETS-SHEET 3.

E fi e az ATTORNEY J. GELB.

ELECTRIC ARC LAMP.

APPL'ICATION mzo JUNE 29. me.

Patented July 16, 1918.-

4 SHEET$-SHEET 4 IN V EN TOR.

ATTORNEY ELECTRIC-ARC "LAMP.

Application 'fl-id .Tiiir 29, 1916] "seriai N'oI item.

jectblf'th Ellip'i oi' oif Kii stria, residing-inthe lioroii'g'li of Bronid'; county of B'ronii, and state o'f'Nefw York, have iiiy ented c'e rg. tain new and useful-"Improvements'ih Elec trio-Arc. Lamb's, (if which the following is a s ecifiati6fi."'

'l hisf invention aims to provide certain imprevemiits in are lamps A especially,

signed for horc rapme: we-1:1: .or for prof jectin'g wqrk','a in the taking'and projecting of'lm'oyiifg 'pitur'es but applicable also to otherj-lis s. I

The aeeofiipafiyigigi drawings illustrate a lamp embodying-the inyention.'

Figureal' is new}. elevation of the complete lamp, partly away;

igfZ is alongitudinal section through the clutches and adj acent parts;

Fig. 3 is a horizontal section on the line 33 ofiFig. '1;

Fig. 4 is a separate detail-of Fig. 3;

Fig. 5 .is a transversesection on the line 55 of Fig. 3; E g

Figs. 6 and 7 are horizontal sections on the lines 6'-6 and 7'-"(respecti ely of Fig. 1, looking in the directions of the arrows;

Fig. 8 a transverse View approximately on the line 8 8 of Fig. 2;

Fig. 9 is a detailillustrating a spring connection in the clutch rods, the View being on the line 9-'9 of Fig. 2..

Referring now to the embodiments of the invention illustrated there re fiXedelectrode A and movable electrodesB- and B. The fixed electrode is supported in a clamp C by means of a setscrew D, the clamp being threadedon a screw E on theforward end of a bracket F which is fastened to a fixed cross bar G mounted on a frame comprising longitudinally extending -rods- H connected to each other by intermediate fixed cross bars J and end cross bars K.

The fixedelectrode A can be adjusted transversely inward or outward by the screw he. turncdaboutthe screws- E asa center and thus permit a radial adjustment of the electr odets'. The bracliets' F for the movable electrodes are'connected to cross bars M and Specification of Letters Patn'ti' Patfitd 3 f 19 M which are mounted to. slide on the rods.

H so as to move the elem-began; and Btowardfand away from. the fixed electrodes.

Binding 'shrews' N and N are mounted on the brackets which carry the movable eleca trods' for attachments of the wires and O, F 1g. 1.: The current passes from't-he binding sci-aw N through the electrodes .B,

A and B"i1;1 turn to thebinding screw bl. The frame consisting of -the rods H and cross suspended by posts P below a plate Q,\Vl110l1' in turn'is suspendedbf'y rods,

R from the of theilamp, which head also carried the sgleno'id Tand coil U which control the feedingi of the carbons and the regulation of the arc. The plate Q, carries binding posts V and V which are connected to the wires 0 nd O! and also to wiresW" and W running through the coils above in the usual way to the line.

The cross bar M is connected by-an uprigl'it X to a rack ;Y which slides longitu dina'illy along the underside of the plate Q, and is' actuated by a pinion Z atthe right hand-side of the machine; while the cross bar M which carries the movable electrode B is similarlyconnected by an upright X? to a rack Y sliding beneath the plate Q and actuated, by a pinion Z, at the left of the machine. The overlapping arrangement of the racksY and Y isindicated in Figs. 6'

and T. The weight; of the electrodes and brackets is" carried, through the cross, bars M and M. on the rods H, on which they slide freely, and theengagement of the racks and pinions is not a supporting engagement but merely, a driving one. The upright X has a vertically'ad-justableconnection with the sliding cross bar M, as shown in Fig. 5, to adjust the rack above in proper engagement with'its pinion, and the upright X is similar mounted. The pinions Z and Z are freely supported on pivots in brackets 2 depending from the plate Q.

The pinion Z is. actuated by means of a vertical rack bar 3 which extends upward through the'plate Q and carries on its upper end a "weight comprising a cross bar 4 having its-ends arranged to slide on the rods R. The pinion Z is similarly actuated by a vertical rack bar. 3 having a weight at at its upper end. The weights, therefore, turn the pinions in the directions indicated by the arrows and these in turn slide the racks and the movable electrodes toward each other.

Depending from the weights 4.- and 4 are clutch-operated rods 5 and 5 which are automatically lifted, carrying the racks with them, when the electrodes are to be separated. These clutch-operated rods pass through clutches 6 and 6 of a known type which are operated by rods 7 and 7 connected at their upper ends to a cross head 8 which is pivotally mounted in the usual way on the solenoid core 9, the lower end of which is connected to the cylinder 10 of a dashpot, the piston rod 11 of which is fixed to across bar 12 supported by rods 13 from overhead. The clutch operating rod 7 (and "I similarly) has a yielding spring connection 14 (Fig. v9) at an intermediate point of its length.

-When there is no current the solenoid core falls so that the lower leaves of the clutches 6 and 6 strike on the plate Q, and the clutches release the rods 7 and 7 allowing the weights 4: and 4: and their rack bars to fall until the electrodes are brought into contact with each other, each of the movable electrodes moving independently of the other. If now the circuit of the lamp be closed the solenoid works in the usual way to pull up its core at a rate moderated by the dashpot The clutches are brought into engagement with the rods 5 and 5. The latter are then lifted and the electrodes separated slowly until the determined length of arc is struck, the solenoid holding the parts in this position. As the electrodes burn and the arcs lengthen the solenoid lowers the clutches and releases the weighted rods 5 and 5 so as to cause the electrodes to move toward each other and shorten the arcs.

The same arrangement may be applied to a lamp with a single arc, this being especially useful for proj ectin apparatus, either by using only one mova ble electrode and one-half of the operating mechanism, or by omitting the intermediate fixed electrode and using the two movable electrodes with the double operating mechanism shown. Or a greater distribution of 1i ht may be secured, as is desirable in taklng pictures, by increasing the number of arcs; as for example by mounting an additional set of electrodes in the brackets C (Fig. 1), below the electrodes shown, for four arcs, or by mounting two additional sets of electrodes in a similar way for six arcs. The same mechanism may be used for operating electrodes in inclined or other non-vertical directions; the rack and pinion mechanism or chain mechanism or other equivalent means being useful wherever a change of direction is necessary and regardless of the style of magnet or other motor device used.

Though l ha \c described with great particularity of detail a certain embodiment oi my invention yet it is not to be understood therefrom that the invention is restricted to the particular construction illustrated and described. Various other constructions may be designed by those skilled in the art without departing from the invention as defined in the following claims.

What I claim is 1. An electric arc lamp including in combination a clutch, a vertical rack actuated by gravity in one direction and magnetically in the opposite direction to maintain the length of the arc, a horizontal electrode, a clamp for holding the same, a bracket connected at its outer end with said clamp, means for adjusting said clamp toward and away from said bracket, movable cross-bars connected to the inner end of said bracket, longitudinally extending rods adapted for engagement with and upon which said cross-bars are slidable and a horizontal rack to shift said electrode.

2. An electric arc lamp including in combination supporting means, horizontal electrodes located in a vertical plane in front of and below said supporting means, brackets and transversely ad ustable clamps for bolding said electrodes, means for shifting said brackets and clamps horizontally on said supporting means and means for maintaining an are between said electrodes.

An electric arc lamp including in combination supporting means, a stationary horizontal electrode, a bracket and a transverse] y adjustable clamp for supporting said electrode, a plurality of movable horizontal electrodes, longitudinally adjustable brackcts and transversely adjustable supporting means carried by said brackets for the mov able electrodes, and means carried by the above mentioned supporting means for shifting said movable electrodes for main-. taining arcs between said movable and said stationary electrodes.

1. An electric arc lamp including in combination a stationary electrode, a plurality of movable electrodes, clutches to control the operation of said movable electrodes, gravity operated means for independently operating each movable electrode in one direction, and a single magnetic means for operating said electrodes in the opposite direc tion, and compensating means between said magnetic means and said clutches for maintaining arcs of equal length between the electrodes.

5. An electric arc lamp including in combination supporting means, a stationary electrode, a bracket carried by said supporting means, a radially and transversely adjustable clamp carried by said bracket for the stationary electrode, a plurality of movable electrodes, slidable brackets and radially and transversely adjustable clamps electrodes and a compensating device becarried by said slidable brackets for the tween said clutches and said magnetic means movable electrodes, means for shifting each to maintain arcs of equal length between 10 of said slidable brackets independently in the electrodes.

one direction, magnetic means for shifting In Witness whereof, I have hereunto the movable brackets and electrodes, clutches signed my name. to control the shifting of said brackets and JOSEPH GELB.

Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of Patents, Washington, D. G. 

